On the Debian machine it says
CONFIGURATION SUMMARY
=====================

Host is i586-pc-linux-gnu
Platform is Linux (LINUX is defined).
Graphing of function tables is enabled (WINDOWS is defined).
FLTK is available (USE_FLTK is defined).
FLTK widgets are enabled (USE_FLTK_WIDGETS is defined).
Tcl/Tk GUI is enabled (USE_TCLTK is defined).
Real-time audio is available (USE_RTAUDIO is defined).
Audio Formats suported are...  WAV  AIFF  IRCAM

This is confusing as there is no sound card on this machine, so I did
not expect it to build USE_RTAUDIO.  Does this have to be set explicitely?
==John ffitch